Product name:foldable backpack Product size about : Expansion: 40*26*14cm/15.7*10.2*5.5in Folding: 14*10*5cm/5.5*3.9*1.96in Product color: As shown in the figure Product material:Polyester product features: 1. Large Capacity: This outdoor bike backpack features a spacious main compartment that provides plenty of space to store your belongings while biking, hiking or traveling. It can easily hold essentials like clothing, snacks, water bottles, and other personal items. 2. Portable and lightweight: The backpack adopts a foldable and lightweight design, making it easy to carry and transport. When not in use, it conveniently folds down to a compact size for easy storage on your bike or luggage. 3. Durable and waterproof: This backpack is made of high-quality waterproof material to withstand outdoor environments. It protects your belongings from light rain or splashing water, ensuring they stay dry and safe. 4. Comfortable and Adjustable: The shoulder straps of this backpack are padded and adjustable, providing a comfortable fit for different body shapes and sizes. Breathable mesh back panel helps enhance ventilation and reduce sweating for a more comfortable and enjoyable outdoor experience. 5. Multifunctional and practical: This backpack is not only suitable for cycling, but also perfect for various outdoor activities such as hiking, camping and traveling. It features multiple pockets and compartments, including a dedicated hydration pocket, mesh side pockets for a water bottle, and a front pocket for easy access to smaller items. Reflective strips on the backpack also improve visibility and safety when riding or hiking at night. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Shipment includes: 1 pc foldable backpack